Sparking plug for explosion and other engines



June 26, 1928.

. M. BAILLY SPARKING PLUG FOR EXPLOSION AND OTHER ENGINES Filed July 28. 1922 1+ l r n/ IJ. 1 ,//f/ //7/// J. f. WMV wwwa f//WUJ/ y f f 04%/ l 1 ff /ff/ 4. a, f-

l www lu .s @new 1 v yw Patented June 26, 1928.

UNITED sTATEs m BAILLY, l' BRUSSELS, 'BELGIUI.

SPABXING PLUG FOB EXPLOSIONVAND OTHER ENGINES.

Application led July 28, 1922, Serial No. 578,233, and in Belgium July 90, 1981.

This invention relates to improvements in spark plugs for internal combustion engines, the object of the invention being to effect improvements in the construction of the plug whereby it is prevented from becoming fouled by carbon deposits and its eiiciency is increased.V

With the above and other objects in view the I'invention consists in the construction, combination and arrangement of devices hereinafter described and claimed.

Several constructions according to the inventionA are illustrated by way of example in the accompanying drawings in which:

Fig. 1 is a central longitudinal section of a plug with multiple electrodes.

Fig. 2 is a cross-section on the line A-B of Fig. 1.

Fig. 3 is a central longitudinal section of a modiied construction ofthe plug.

Fig. 4 is a cross-section, on the line C-D of Fig. l.

Figs. 5 and 6 are sections similar to those of Figs. 1 and 2 of another modified construction.

Fig. 7 shows a ring for regulating the' length of the ignition spark.

lVith reference to the drawings, and especially 'to Figs. 1 and 2, the central conductor rod 1 to which is connected in the usual manner the current supply wire, terminates at an intermediate point of the length of the=plug ina llange or disc 2. This rod is mounted in the interior of the porcelain 4 or other insulating material, into which fits with a tight lateral joint a part 5, also of porcelain or other suitable insulating material. A recess in the base of the said part 5 constitutes a disruption chamber or chamber for the passage of sparks between the said disc 2 and a series of .electrodes 3 embedded in the insulating material 5.v These electrodes terminate close to the usual sparkingpoints of the plug and produce at these `ends the usual ignition spark which ap ars between the electrodes and the body o the plug F.

It will be understood from the foregoing that, owing to the tightjoint between the two insulating cores of the plug, the ark which appears between the end disc o the rod 1 and one of the conducting rods 3, is unable 'to reach the inner end of the plug and therefore ground. VThe spark passes through the chamber 8 of the end disc 2, first to one rod 3, then to another owing to the movement of* the ball 1.9. The spark appears therefore between the disc or flange terminating the central rod proper, and one or another of the conductors which lead to the sparking points. This conductor, on the appearance of the spark, supplies the nition spark between its other end and one of the sparking points 9 of the plug. The spark therefor is remforced by the disruption of the current on the central path of the current, and on that account any deposit is destroyed by fusion. Moreover, ever.

should one of the electrodes become fouled,'

there is still left a free passage for the current through the other electrodes and conductors With reference to Figs. 3 and 4, the tight closing of the chamber 8 for disruption of spark or sparks, is obtained owing to the taper of the insulating material -5 in which are embedded the electrodes. The tightening is eifected by means of the nut F2 which acts ou the upper insulating material or porcelain 4 and is screwed into the nut F1 which receives the lower conical insulating material. 19 is a ball of steel or other suitable material which rolls freely between the upper ends of the electrodes 3 and the upper surface of the lowervinsulating material 5, thus forming an automatic disrupter-distributor. As this ball does not touch the conducting disc 2 which is a diametrically enlarged part oi the electrode 1, a disruption spark is produced between the electrode 1 and the ball 19, and the current passes thence to one of the electrodes 3 b direct contact or by alnew disruption spar By this construction and the provision of the ball 19 which is movable in all directions the movement of disruptions or breaks of the current on its assage into the plug is increased and an igmtion spark is produced which is of a particularly high temperature such as is required or the fusion of any carbon deposit which may tend to form. Between the live electrode and the inner end of shell F of the p lug appears the ignition spark for the engmWith reference to Figs. 5 and 6 which show a plug of a large size, the inne;` end or shell F is cylindrical both outside and inside, and receives the upper and lower insulating material held by the nut F. Between the said material is provided the spark chamber 8. The lower insulator is built up of two parts 5, 51 which 'engage lll i supplementary disruption.

with each other, the electrodes 3 being, after mounting and tightening flush the upper surface of the said insulator. Owing to this engagement a better joint is obtained in mounting the electrodes in the insulating material. V

The electrodes 3 are enlarged at their lower ends as at 11 to form ilanges to hold washers l0 which play freely on the said end so as to be able to move along the electrodes 3, and parallelto the plug walls F which act as ground electrodes in order to produce a These disruption sparks appear therefore between the disc 2 and the ball 29, between the ball 29 and the upper end of an electrode, between a washer on the lower end of the electrode, a

washer of the adjoining (neutral) electrode;

and the inner end or shell of the sparking plug. With reference to Fig. 7 the inner end of the plug has at its inner terminal part.a

fixed washer l0, the inner section of which follows three axes of a circle, eccentric relatively to the center of the washer. According to the positiony of the electrodes 3 rela.- tive to the said washer, the length of the ign-ition spark is more or less great, since the distance between the endsof the electrodes and the nearest point ofl the washer will vary. A

It must be understood from the foregoing that the plug with multiple disruptors and automatic distributor, such as is described in the foregoing, never becomes sooted up for the following three reasons: the high temperature of the ignition spark; the relative mobility of the parts between which the choking or sooting up mightv take place, and the failure of the distributor to be affected by the inii'uence of the electrodes i-n shortcircuit.

The constructions hereinbefore described ber extending to and projecting from the' inner end of the core and an automatic disytributor-disruptorl comprising a conductor member arranged and movable in all directions in said chamber, 'and active by its movementto produce current disruption sparks between itself, the end of said central conducting rod and the adjacent end of one or the other of the said plurality of electrodes and thereby produce a spark between the last named electrode and one of the sparking points.

2. A sparking plug for internal combustion engines comprising an insulating core 4having a plurality of members and a chamber provided between two of said members, a

plug body in which said coreis arranged, a central conducting rod extending to one side of said chamber, a plurality of electrodes in the other side of said chamber extending to and projecting from the inner end Aof the core and conducting members on the end of the electrodes and active to produce a further disruption spark between themselves and the inner end of the body of the plug.

In testimony that I claim the foregoing as my invention, I have signed my name.

MAX BAILLY. 

